On Thu, Jun 10, 2021 at 04:09:12PM -0500, Tyler Hicks wrote:
dma-buf backed shared memory cannot be reliably freed and unregistered during a kexec operation even when tee_shm_free() is called on the shm from a .shutdown hook. The problem occurs because dma_buf_put() calls fput() which then uses task_work_add(), with the TWA_RESUME parameter, to queue tee_shm_release() to be called before the current task returns to user mode. However, the current task never returns to user mode before the kexec completes so the memory is never freed nor unregistered.
Use tee_shm_alloc_kernel_buf() to avoid dma-buf backed shared memory allocation so that tee_shm_free() can directly call tee_shm_release(). This will ensure that the shm can be freed and unregistered during a kexec operation.
Fixes: 09e574831b27 ("tpm/tpm_ftpm_tee: A driver for firmware TPM running inside TEE") Fixes: 1760eb689ed6 ("tpm/tpm_ftpm_tee: add shutdown call back") Signed-off-by: Tyler Hicks tyhicks@linux.microsoft.com
Acked-by: Jarkko Sakkinen jarkko@kernel.org
drivers/char/tpm/tpm_ftpm_tee.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/char/tpm/tpm_ftpm_tee.c b/drivers/char/tpm/tpm_ftpm_tee.c index 2ccdf8ac6994..6e3235565a4d 100644 --- a/drivers/char/tpm/tpm_ftpm_tee.c +++ b/drivers/char/tpm/tpm_ftpm_tee.c @@ -254,11 +254,11 @@ static int ftpm_tee_probe(struct device *dev) pvt_data->session = sess_arg.session; /* Allocate dynamic shared memory with fTPM TA */
- pvt_data->shm = tee_shm_alloc(pvt_data->ctx,
MAX_COMMAND_SIZE + MAX_RESPONSE_SIZE,TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
- pvt_data->shm = tee_shm_alloc_kernel_buf(pvt_data->ctx,
MAX_COMMAND_SIZE +MAX_RESPONSE_SIZE);
dev_err(dev, "%s: tee_shm_alloc failed\n", __func__);
dev_err(dev, "%s: tee_shm_alloc_kernel_buf failed\n", __func__);-- 2.25.1
/Jarkko